[SOUND] The ability to learn grammar has also been found to be driven by the age at which a second language is learned. Interestingly, children who learn two languages learn to distinguish the two grammars quite early. Work done by Parody and Genesee has found that children can distinguish verb placement in French and English. And they can do it correctly by three, four years of age without any problem. In the last section we considered the idea of phonological bootstrapping, this idea by Demuth that how we process sound, and speech sound in particular, could help as a base for the learning of grammar. So you remember the example of permit and permit. Right? These different sounds, forms, indicating whether it's a verb or a noun. The fact that Spanish speaking children use a trisyllabic cut, which is equivalent to an article and the noun, la casa. And so, they learn them as one unit. And this idea that sound is sensitive, and speech sounds are sensitive to age of acquisition would also suggest that the base gets formed differently when a language is learned later in life.